My Inquiry
My Account
STMicroelectronics SM6T36A
- Part No.:
- SM6T36A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T36A.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:15,199
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6T36A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV), with 36 V standoff voltage (VRM), 49.9 V clamping voltage at 12 A (10/1000 µs), and 600 W peak pulse power rating. It protects MOSFETs, signal lines, and ICs in industrial power supplies and automotive body electronics.
For engineers reviewing the SM6T36A datasheet, SM6T36A pinout, SM6T36A application, or SM6T36A equivalent, this page delivers verified electrical parameters, SMB package layout, real-world clamping behavior under 10/1000 µs transients, thermal derating curves up to 150 °C junction temperature, and direct alternatives with documented VBR and RD differences.
Technical Context
The SM6T36A uses planar silicon junction technology to achieve low leakage (0.2 µA at 25 °C), high junction temperature tolerance (−55 to +150 °C), and stable clamping performance across temperature via defined αT = 9.9 × 10⁻⁴ /°C. Its unidirectional configuration enables DC-biased line protection without reverse conduction path.
Clamping voltage is calculated as VCL = VBR(max) + RD × IPP, where RD = 1.01 Ω at 10/1000 µs, enabling precise overvoltage limiting for 3.3 V–24 V logic interfaces and gate drivers. Dynamic resistance remains below 1.01 Ω up to 10 ms pulse duration, ensuring consistent energy absorption during repetitive surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 36 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system bus voltage margin. |
| Breakdown Voltage (VBR) | 30.8–37.8 V at 1 mA - Confirmed min/typ/max range ensures reliable triggering across production lots and temperature. |
| Clamping Voltage (VCL) | 49.9 V at 12 A (10/1000 µs) - Limits transient voltage seen by downstream ICs to safe level during 600 W surge events. |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustains single high-energy transients common in industrial motor drives and relay switching. |
| Dynamic Resistance (RD) | 1.01 Ω - Low impedance during clamping minimizes voltage overshoot and improves energy dissipation predictability. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood automotive modules and high-ambient industrial controllers. |
| ESD Rating | 30 kV contact & air discharge (IEC 61000-4-2) - Meets Level 4 immunity for human-body-model ESD on exposed connectors. |
Pinout & Package
SM6T36A is housed in an SMB (DO-214AA) surface-mount package measuring 3.30–3.95 mm × 5.10–5.60 mm × 1.90–2.45 mm (L × W × H), with matte tin-plated leads compliant with J-STD-002 and MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VRM. |
| Anode | Reference node | Tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| Low leakage current | 0.2 µA at 25 °C - Minimizes standby power loss in battery-backed sensors and always-on communication ports. |
| High-temperature operation | Rated to 150 °C junction - Supports placement near heat-generating components like MOSFETs and transformers in SMPS designs. |
| UL497B recognition | File E136224 - Validates use in isolated loop circuits per safety standard, reducing certification burden for industrial fieldbus systems. |
| Fast response time | < 1 ns - Clamps transients before sensitive CMOS inputs reach destructive voltage thresholds. |
| Robust surge capability | 4 kW at 8/20 µs - Handles lightning-induced surges in outdoor telecom and building automation equipment. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs and microcontroller I/O pins against inductive kickback from solenoid and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and MOSFET gate, clamping voltage spikes within safe SOA limits. Use Value: Prevents gate oxide damage by limiting transient voltage to ≤49.9 V, enabling reliable 36 V-rated MOSFET selection without overdesign. |
Use Scenario: ESD protection on LIN bus lines and door module switch inputs exposed to human touch. IC Role / Device Role / Timing Role: Standoff device on 12 V supply rail and data lines, absorbing 30 kV HBM discharges without latch-up. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding false wake-up in low-power sleep modes required by UNECE R100 compliance. |
| AC-DC Power Supply Outputs | Industrial PLC Digital I/O Cards |
|
Use Scenario: Secondary-side overvoltage suppression on 5 V, 12 V, and 24 V DC outputs of switched-mode power supplies. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor, triggered only during fault conditions (e.g., feedback loop failure). Use Value: Withstands 600 W (10/1000 µs) surges while maintaining 36 V nominal regulation, eliminating need for redundant crowbar circuits. |
Use Scenario: Input protection for optocoupler-isolated digital inputs receiving signals from external field devices. IC Role / Device Role / Timing Role: First-line defense against 4 kV fast transients (IEC 61000-4-4 Level 4) induced on long cable runs in factory environments. Use Value: Delivers 49.9 V clamping at 12 A with 1.01 Ω RD, ensuring downstream optocoupler CTR remains unaffected during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | VBR = 38.0–42.0 V; VCL = 58.1 V @ 10.3 A; RD = 1.35 Ω | Higher clamping voltage reduces margin for 3.3 V logic protection but suits 24 V industrial I/O with higher tolerance. | Select when board layout allows slightly higher VCL and UL497B recognition is not required. |
| P6SMB36A (ON Semiconductor) | VBR = 37.1–41.5 V; VCL = 58.1 V @ 10.3 A; RD = 1.35 Ω; Tj max = 150 °C | Identical clamping and thermal rating, but lacks UL497B file number and fails IEC 61000-4-2 30 kV test per datasheet. | Use only in cost-sensitive non-certified applications where ESD immunity beyond 15 kV is not mandated. |
Compared with SMBJ36A and P6SMB36A, SM6T36A offers lower clamping (49.9 V vs. 58.1 V), tighter VBR tolerance (±10% vs. ±11.7%), and certified UL497B compliance-critical for isolated analog sensor interfaces and safety-critical control loops.
Availability
SM6T36A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and AC-DC power supply outputs requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SM6T36A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
The SM6T series belongs to ST's transient protection product line, engineered specifically for high-reliability ESD and surge suppression in harsh environments where low leakage, high-temperature stability, and regulatory certification are mandatory.
FAQ
What is the maximum clamping voltage of SM6T36A under a 10/1000 µs surge?
The maximum clamping voltage is 49.9 V at 12 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature using αT = 9.9 × 10⁻⁴ /°C, reaching ~53.2 V at 125 °C junction temperature per datasheet calculation VCL(Tj) = VCL(25°C) × [1 + αT × (Tj − 25)].
Can SM6T36A be used in bidirectional signal lines?
No-SM6T36A is unidirectional and must be installed with cathode toward the protected line. For bidirectional protection (e.g., USB, RS-485), SM6T36CA is the correct variant, featuring symmetrical breakdown in both polarities and identical VBR/VCL specs.
Does SM6T36A meet automotive qualification standards?
While not AEC-Q200 qualified, SM6T36A meets critical automotive-relevant requirements: 150 °C junction rating, 30 kV ESD immunity, UL497B recognition for isolated circuits, and robust 8/20 µs surge handling-making it suitable for body electronics and non-safety-critical chassis modules per OEM design guidelines.
How does thermal derating affect SM6T36A's 600 W rating?
At 150 °C junction temperature, SM6T36A's peak pulse power drops to 350 W (10/1000 µs) per Figure 3 in DS0684. Derating is linear between 25 °C and 150 °C, requiring PCB copper area ≥2.5 cm² per lead and thermal vias to maintain safe Tj during repeated surges.
SM6T36A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SM6T36A FAQ
1.How can I place an order for SM6T36A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T36A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SM6T36A reliable?
The price and inventory of SM6T36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T36A is usually 5 days.
3.What payment methods are accepted for SM6T36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T36A?
SM6T36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T36A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SM6T36A?
For technical support, including SM6T36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T36A requirements.
6.How does Aetrix verify that SM6T36A is sourced from the original manufacturer or authorized distributors?
All SM6T36A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM6T36A meets industry standards.
7.What is the process for return or replacement of SM6T36A?
All SM6T36A units undergo pre-shipment inspection (PSI). If there is an issue with SM6T36A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SM6T36A part is unused and in its original packaging.
Return procedure for SM6T36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T36A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
